NDLI: Gold nano particles catalyzed oxidation of hydrazine by a metallo-superoxide complex: experimental evidences for surface activity of gold nano particles

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Banerjee, Rupendranath Singh, Bula Das, Ranendu Sekhar Mukhopadhyay, Subrata
Description	Author Affiliation: Das RS ( Department of Chemistry, Jadavpur University, Kolkata 700 032, India.)
Abstract	Gelatin-capped gold nano particles (GNPs) of diameter 23, 28 and 36 nm were prepared and characterized as almost monodispersed, near-spherical solids. In acidic media, these GNPs at their very low concentration level $(∼10^{−13}$ M) catalyze the oxidation of hydrazine by the metallo-superoxide, $[(NH_{3})_{4}Co^{III}(μ-NH_{2},μ-O_{2})Co^{III}(NH_{3})_{4}](NO_{3})_{4}$ (1). In the presence of a large excess of hydrazine over [1], the catalyzed oxidation is first-order in [1], [GNPs] and media alkalinity. The pure first-order dependence implies that the size as well as the nature of the catalyst remained unchanged during the reaction. The catalytic efficacies increased with increased total surface area of the GNPs. Increasing $T_{Hydrazine}$ $(T_{Hydrazine}$ is the analytical concentration of hydrazine ) tends to saturate the first-order rate constant $(k_{o})$ for hydrazine oxidation and a plot of $1/k_{o}versus$ $T_{Hydrazine}$ was found to be linear at a particular [GNPs], indicating the GNPs assisted deprotonation of $N_{2}H_{5}^{+}$ to $N_{2}H_{4}.$ The rate constants show a non-linear behavior with temperature studied in the range 288–308 K. At a lower temperature interval, viz. 288–298 K, $k_{o}$ increases with increasing temperature whereas at temperature interval, viz. 303–308 K, $k_{o}$ decreases with temperature. Such a variation indicates the important process of absorption and desorption of the reactants on and from the surface. A plausible mechanism for the GNPs catalyzed oxidation of hydrazine is suggested.
ISSN	14779226
Issue Number	15
Journal	Dalton Trans.
Volume Number	41
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2012-04-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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